PC-505B Manual, Rev. 201013
Warner
Instruments
A Harvard Apparatus Company
40
APPENDIX
Specifications
HEADSTAGES
LC-201B Headstage
(50 G
/500
)
single channel currents to 200 pA
whole cell currents to 20 nA.
HC-202B Headstage
(50
G
/50
)
single channel currents to 200 pA
whole cell currents to 200 nA
HB-205B Bilayer Headstage
(50 G
modified)
for artificial bilayer capacitances up to 250 pF
currents to 200 pA
Noise (referred to input)
Measured with an 8-pole Bessel
filter, input open, 50 G
resistor:
DC to 1 k Hz 0.038 pA RMS
DC to 5 k Hz 0.170 pA RMS
Bandwidth
25 kHz
VOLTAGE CLAMP COMMANDS
Command In
± 10 V maximum, AC or DC
applied to input
Voltage Hold
± 200 mV with 10-turn control
Junction Zero
± 100 mV with 10-turn control
Internal Test Pulse
1 Volt 50/60 Hz (line frequency) square wave
attenuated by
COMMAND SENSITIVITY
Command Sensitivity
attenuates at x0.1, x0.01, and x0.001
Zap
1.0 Volt Pulse
adjustable duration from 0.1 to 10 ms
CURRENT CLAMP COMMANDS
Command In
±1000 pA maximum with Command Sensitivity @ x0.1
±100 pA maximum with Command Sensitivity @ x0.01
±10 pA maximum with Command Sensitivity @ x0.001
Current Hold
± 1 nA with 10-turn control
Internal Test Pulse
1 nA 50/60 Hz square wave
Command Sensitivity
attenuates at x0.1, x0.01, and x0.001
CAPACITANCE COMPENSATION
C
–
FAST 1
(Voltage Mode)
0.1 to 1.75
s
0 to 5 pF
C
–
FAST 2
(Voltage Mode)
0.33 to 8.5
s
0 to 15 pF
C
–
SLOW
0 to 100 pF with 10
–
turn control
Series R
0 to 100 M
with 10
–
turn control
% Correction
0 to 90% of series R
Leak Subtraction
50
G
Headstage Resistor:
to 50
G
500
M
Headstage Resistor:
to 500
M
50 M
Headstage Resistor:
to 50
